public async ValueTask <bool> MoveNextAsync()
{
ReadLoop:
if (_disposedTokenSource.IsCancellationRequested)
{
return(false);
}
if (_buffer.TryDequeue(out var current))
{
_current = current;
_currentPosition = Position.FromInt64(current.OriginalPosition.Value.CommitPosition,
current.OriginalPosition.Value.PreparePosition);
return(true);
}
var correlationId = Guid.NewGuid();
var readNextSource = new TaskCompletionSource <bool>();
var(commitPosition, preparePosition) = _nextPosition.ToInt64();
Log.Verbose(
"Catch-up subscription {subscriptionId} to $all:{eventFilter} reading next page starting from {nextPosition}.",
_subscriptionId, _eventFilter, _nextPosition);
_bus.Publish(new ClientMessage.FilteredReadAllEventsForward(
correlationId, correlationId, new CallbackEnvelope(OnMessage), commitPosition, preparePosition,
ReadBatchSize, _resolveLinks, false, (int)_maxWindowSize, default, _eventFilter, _user));
private void ReadPage(Position position, Func <Message, CancellationToken, Task> onMessage)
{
Guid correlationId = Guid.NewGuid();
Log.Verbose(
"Subscription {subscriptionId} to $all:{eventFilter} reading next page starting from {nextRevision}.",
_subscriptionId, _eventFilter, position);
var(commitPosition, preparePosition) = position.ToInt64();
_bus.Publish(new ClientMessage.FilteredReadAllEventsForward(
correlationId, correlationId, new ContinuationEnvelope(onMessage, _semaphore, _cancellationToken),
commitPosition, preparePosition, ReadBatchSize, _resolveLinks, _requiresLeader,
(int)_maxSearchWindow, default, _eventFilter, _user));